水溶性壳聚糖对水泥水化行为的影响.pdfVIP

学兔兔 全国中文核心期刊 杆 建巍粉 水溶性青聚糖对水泥水化行为昀影响 雷西萍 (西安建筑科技大学 材料科学与工程学院，陕西 西安 710055) 摘要：以壳聚糖、马来酸酐为原料制备N一马来酰化水溶性壳聚糖(N—M—c1S，对其化学结构进行红外表征，研究其对水泥净 浆、砂浆性能的影响。结果表明，当水灰比为O．35时，掺有这种水溶性壳聚糖(掺量为水泥质量的1％)的水泥净浆初始流动度为230 mm，经过60 min后降为198 mm，减水率为20．4％，达到了普通减水剂的减水率指标；掺水溶性壳聚糖后砂浆的3 d、7 d、28 d抗压强 度比不掺的空白样有所提高。并使用扫描电子显微技术对各个时期水化产物的形貌进行了观察与比较。 关键词：壳聚糖；马来酸酐；水溶性壳聚糖；水泥水化 中图分类号：TU528．042．2 文献标识码：A 文章编号：1001—702X(2010)05—0060—03 Effect of water-soluble chitosan on the behavior of cement hydration LEI Xiping (College of Materials Science and Engineering，Xi an University of Architecture and Technology，Xi an 710055，Shanxi，China) Abstract：In this paper，water-soluble N-maleylation chitosan(N-M-CTS)was prepared by using CTS and maleic anhydride as raw materials，its chemical structure Was characterized by infrared analysis，and its impacts on the performance of cement paste and mortar were discussed．The results showed that the initial fluidity of the cement paste mixed with N—M—CTS (1％ of the cement mass)was 230rain when W／C Was O．35，while after 60min，the fluidity decreased to 198 mm and the water—reduction ratio Was 20．4％，reaching the ratio of normal water reducing agent；the compressive strength of mortalmixed with N—M—CTS Was a little higher than the blank sample(which refers to mortar without CTS)after hydration for 3 d，7 d and 28 d．As well，the morphologies of hydration products at various hydration periods were observed by SEM． Key words：chitosan；maleic anhydride：water-soluble chitosan；cement hydration